You should consider setting up a USB qube using the salt scripts for a usb keyboard.
(This link isn’t for you, but for anyone else who stumbles across this post. You already know all of this)
They won’t unless you have a USB qube. Dom0 doesn’t have qubes-usb-proxy needed to pass it through.
Most microphones are PCI devices, not USB devices. Some are, but yours isn’t.
That’s because dom0 claimed the USB controllers of your machine.
Yeah, you could, but you’ll lose your internal keyboard and mouse if the webcam is on the same controller, and that’s always good fun…
You’re still going to be stuck with the problem of how to get it into a Qube if you haven’t got a USB Qube…
Honestly, literally any USB camera that has a driver in the Linux kernel will be compatible with Qubes OS.
Honestly, give this a go:
It’ll do exactly what you need it to do.
The only thing you can’t really do is hide USB controllers from dom0. If you do, you won’t be able to enter your LUKS encryption password on boot…
Hope this helps 